Supplement. This Supplement is divided in to four parts. The first one gives all magnitudes of the 1920 earthquake found in the literature and all regression graphs used for magnitude conversion (Table S1 and Fig. S1). The second part provides figures, which show the 1920 analogue-quake determination (Figs S3 and S4). The third part provides documents about archives of the 1920 earthquakes (Fig. S2). The last part provides a tsunami traveltimes map (Fig. S5). Additional references are given at the end. A catalogue with homogenized moment magnitudes higher than 5.0 is also available in the Supporting Information online.

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